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Summary: Implements several changes needed for the CO3Dv2 release: - FrameData contains crop_bbox_xywh which defines the outline of the image crop corresponding to the image-shaped tensors in FrameData - revised the definition of a bounding box inside JsonDatasetIndex: bbox_xyxy is [xmin, ymin, xmax, ymax], where xmax, ymax are not inclusive; bbox_xywh = [xmin, ymain, xmax-xmin, ymax-ymin] - is_filtered for detecting whether the entries of the dataset were somehow filtered - seq_frame_index_to_dataset_index allows to skip entries that are not present in the dataset Reviewed By: shapovalov Differential Revision: D37687547 fbshipit-source-id: 7842756b0517878cc0964fc0935d3c0769454d78